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An Implementation of Rotor Speed Observer for Sensorless Induction Motor Drive in Case of Machine Parameter Uncertainty

Hau Huu Vo, Pavel Brandstetter, Thinh Cong Tran, Chau Si Thien Dong

DOI: 10.15598/aeee.v16i4.2973


Abstract

The paper describes observers using model reference adaptive system for sensorless induction motor drive with the pulse width modulator and the direct torque control under the circumstances of incorrect information of induction motor parameters. An approximation based on the definition of the Laplace transformation is used to obtain initial values of the parameters. These values are utilized to simulate sensorless control structures of the induction motor drive in Matlab-Simulink environment. Performance comparison of two typical observers is carried out at different speed areas and in presence of parameter uncertainty. A laboratory stand with the induction motor drive and load unit is set up to verify the properties of observers. Experimental results confirm the expected dynamic properties of selected observer.

Keywords


Direct torque control; incorrect parameter; induction motor drive; model reference adaptive system; pulse-width modulator; sensorless control.

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